Sticking with Sterling wouldn't even allow the option of crashing out of the monetary peg if needs be. I think you'd see an exodus of financial institutions' head offices down to London. An independent Scotland simply couldn't afford to bail out a large institution in Sterling, or even if it let banks fail couldn't afford the economic hit because its debts would be denominated in Sterling. Iceland was able to devalue by 60%, Greece wasn't able to.
The point of the currency debate is that it has consequences with whichever choice is taken. Separately applying to join the EU saying "yes I know I have to join the Euro, but I'm not actually going to do that" isn't the best strategy in the book. France may get to pull that kind of thing, but they're already in the tent.
The scottish government would likley be forced to strongly discourage the use of the UK pound to maintain fiscal control.
Do you mean "monetary control"? What do you mean by "strongly discourage"? Forced by whom, or by circumstances?
"strongly discourage" is as easy as not accepting payment tax in pounds.
Forced by currency speculators. New currencies are always strained, and given an independent Scotland would be close to bankruptcy anyway, a fully-pegged currency would be (how do I say this) difficult.